Since we have a general history thread, I thought I'd throw together a quick science thread as well. Because science is awesome.
My first link is for you chemistry fans. Or for people who just like really clever writing. I think that applies to a goodly percentage of you out there. Derek Lowe is a doctor of organic chemistry with a good head on his shoulders. One of his goals in life is to keep said head on his shoulders by avoiding certain chemicals. It's a pretty humorous list of all the ways that chemicals can seriously ruin your day.
There's a fair bit of high level chemistry involved, but you can usually zip over the more technical terms and just assume that when he says that something "absolutely takes the corrosive exploding cake," he knows what he is talking about.